如何切换隐藏字幕在靠后的ExoPlayer？

Question

private MediaSource onCreateMediaSource(Uri uri, Uri subtitleUri) {
    String userAgent = Util.getUserAgent(mContext, "ExoPlayerAdapter");
    MediaSource videoSource = new HlsMediaSource(uri,
            new DefaultDataSourceFactory(mContext, userAgent),
            null,
            null);
    Format subtitleFormat = Format.createTextSampleFormat(
            "1", MimeTypes.APPLICATION_SUBRIP, 0, "en");
    MediaSource subtitleSource = new SingleSampleMediaSource(
            subtitleUri,
            new DefaultDataSourceFactory(mContext, userAgent),
            subtitleFormat, C.TIME_UNSET);

    MergingMediaSource mergedSource =
            new MergingMediaSource(videoSource, subtitleSource);
    return mergedSource;
}

我试过这个：

@Override
public void onActionClicked(Action action) {
    if (action == mClosedCaptioningAction) {
        DefaultTrackSelector trackSelector = mAdapter.getTrackSelector();
        int rendererIndex = 0;
        if (mClosedCaptioningAction.getIndex() == PlaybackControlsRow.ClosedCaptioningAction.INDEX_ON) {
            MappingTrackSelector.MappedTrackInfo mappedTrackInfo = trackSelector.getCurrentMappedTrackInfo();
            TrackGroupArray textGroups = mappedTrackInfo.getTrackGroups(rendererIndex);
            int groupIndex = 0;

            trackSelector.setRendererDisabled(rendererIndex, false);
            MappingTrackSelector.SelectionOverride override =
                    new MappingTrackSelector.SelectionOverride(mTrackFactory, groupIndex, 0);
            trackSelector.setSelectionOverride(rendererIndex, textGroups, override);
        } else {
            trackSelector.setRendererDisabled(rendererIndex, true);
            trackSelector.clearSelectionOverrides();
        }
    }
    super.onActionClicked(action);
}

我得到了这个错误：

E/gralloc: unregister FBM buffer

Answer 1

好吧，我刚刚回答了一个问题，在这里，文本轨迹以一种简单的方式工作。这适用于自适应文件（如HLS)，但我必须修改它以使其适用于渐进式文件（如。mp4与。srt文件合并）。

至少是个起点。

我想绕回一圈，让它完全为您工作，但我认为这可能是一个使用跟踪索引和调整覆盖的问题，以便它不使用AdaptiveFactory（从下面的行）。

TrackSelection.Factory factory = tracks.length == 1
            ? new FixedTrackSelection.Factory()
            : new AdaptiveTrackSelection.Factory(BANDWIDTH_METER);